Amplifier for talking-machines.



J. WOLFF. AMPLIFIER FOR muum; MACHINES.

APPLICATION FIL ED MAY 5, HHS, 1,283,007. Patented Oct. 29, 1918. Fig.61-

UNITED sTATs- Para:

OFFICE.

JOSEPH WOLFE, OF BROOKLYN, NEW YORK, ASSIGNOR TO SONORA PHONOGRAPHCORPORATION, A CORPORATION OF NEW YORK.

AMPLIFIER FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented oct. 2a, 1918.

Application filed May 15, 1918. Serial No. 97,673.

'1 b all whom it may concern:

Be it lmown that I, JOSEPH vVonrr, a subject of the King of GreatBritain and Ireland, and a resident of the borough of Brooklyn, in thecounty of Kings, State of New York, have invented a certain new and useful Amplifier for Talking-Machines, of

nism.

My invention is not limited to such type of machine, but may also beapplied to other forms.

The object of my invention is to produce an amplifier, by means of whichthe purity and sweetness of the reproduced sound will be increased, andthe reproduced sound will be-a true reproduction of the sound asrecorded.

. Another object of my invention is to provide improvements in a soundamplifying device for recording or reproducing sound, by means'ofwhichthe quality and naturalness of the sounds are recorded or reproducedwith greater faithfulness and a more true reproduction of the original.

Another object of my invention is to increase the value of tonereproduction by the means hereinafter described in the specification, ordisclosed in the drawings.

These and further objects will more fully appear in the followingspecification and accompanying drawings, considered together orseparately.

My invention is illustrated in the accompanying drawings, and describedin the specification, in which corresponding parts in all the figuresare designated by similar reference characters.

In the drawings, Figure 1 is a rear elevation of a wooden horn providedwith my invention;

Fig. 2 is aside elevation of the same;

Fig. 3 is a side elevation showing a modification; r

Figs. 4 and 5 are views similar to Figs. 1 and 2, but showing a furthermodlfication;

Figs. 6 and 7 are similar views of a still further modification.

Fig. 8 is a fragmentary rear elevation showing a still furthermodification.

In the drawing I have shown a-horn having a bell outlet end 1, a bodyportion 2, and a restricted elbow portion The extremity at of the elbowportion is adapted to cooperate with the enlarged end of a tone-arm (notshown).

The sound waves set up by the vibrations of a diaphragm carried on thesmaller end of the tone arm are projected horizontally through the bodyof the tone-arm and then projected vertically downward by an elbow insaid tone-arm, as is common. The sound: waves will strike the back ofthe elbow 3 of the horn and be deflected forward through the body 2 andout of the bell 1.

When the sound-waves strike the elbow 3, considerable vibration is setup in that portion of the horn, and such vibrations give off soundswhich mingle with the sound issuing from the bell, and tend to impairthe purity of the reproduction.

On the outside of the back of the elbow of the horn, I place areinforcement to "3 rent in a great measure or entirely, tions of thatportion of the horn.

In Figs. 1. and 2, I show the reinfrnscement in the form of a solidblock 5 Wi'iiGll extends across the elbow, and is thickest at the pointof greatest impact of the soundwave on the elbow and tapers both waysfrom the center longitudinally of the horn.

Fig. .8 illustrates the reinforcement in theform of a bow 6, which isattached to the horn at the extremities of the bow.

ln'Figs. a and 5, the reinforcement shown as of the same shape. in sideelevation, as that shown in Figs. 1 and 2, but is in theform of a rib 7along the center line of the elbow. The rib 7 is shown as extendin withgradually diminishing height from the back to the front of the horn. Arib 7 extends alo 1i p; the top of the horn from the elbow to the bell,and a rib 7 on either side 7 from the tone-arm, as shown by the broken.line a, Fig. 2, and are then projected for- I ward as shown by thebroken line 7 The point of greatest impact is where the lines e and 7)meet, and, in horns of ordinary construction, the vibrations of thatpart of the horn can loe plainly felt.

my invention the vibrations at the point of impact are largely orentirely eliminated, and the sound-waves set up by the vibrations of thediaphragm are projected from the bell end of the horn.

In the embodiment of the invention illustrated, I have shown a horncomposed of wood or other fibrous material, and the preferred form ofhorn is shown in my copending application for patent filed September 1,1915, Serial Number 8,492, but I desire to have it understood that myinvention is not limited to horns of the character described. but may beapplied to any other form of horn.

in 6, 7, and 8, I have shown the truss embers as composed of wood, but Idesire not to limit myseli to the use of such material.

lln accordance with the provisions of the patent statute, i havedescribed the principle oi my invention together with the apparatuswhich 1 now consider to represent the best embodiment thereof, but Idesire to have it understood that the apparatus shown s moi illustrativeand that the invention can be carried out in other ways.

- therein for cl'ianging the direction of sound waves projected throughthe horn, a sup- Y plementai member secured to the back of the 1 ,esaom'bend, said member having considerable thickness at the point at whichthe direction or" the sound waves is changed and tapering to thevanishing point in the direction of the travel of the sound waves.

2. A talking machine horn having a bend therein for changing thedirection of sound waves projected through the horn, a plurality ofsupplemental members secured to the outside of the horn at the bend,each member being disposed. opposite another member, said members havingconsiderable thickness at the point at which the direction of the soundwaves is changed and tapering to the vanishing point in the direction ofthe travel of the sound waves.

3. A talking machine horn having a bend therein for changing thedirection of sound waves projected through the horn, a plurality ofsupplemental members secured to the outside of the horn at the bend,each n'iember being disposed opposite another member, said membershaving considerable thickness at the point at which the direction of thesound waves is changed and tapering to the vanishing point in thedirection of the travel of the sound waves, each element being formed ofa truss element and stay elements, the stay elements connecting thetruss element to the horn at a distance from the truss element.

This specification signed and witi'lessed this 20th day of April, 1916.

' JOSEPH VVOLFF. i l 'itnesses WM. CAREN, MARTIN A, Keenan.

